Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
6 Cards in this Set
- Front
- Back
|
Characteristics of platyhelminthes |
1) Bilateral 2) Acoelomata 3) Triploblastic 4) Protostomia 5) Dorso-ventrally flattened (flatworms) 6) Anterior well-developed (first head) 7) First segmentation (tapeworms) 8) Free-living - Ventral surface - mouth, muscle glands, cilia - Ciliated epidermis - sensory, locomotion 9) Parasites - Hooks and suckers - Chemically resistant cuticle - Adults (vertebrates), larva (invertebrates) 10) No skeleton 11) Protonephridia |
|
|
Effects of parasitism on parasites |
1) Loss of surface epithelium 2) Replacement of epithelium by resistent tegument 3) Adhesive organs 4) Loss of mobility, muscle degeneration 5) Loss of sensory organs 6) Degeneration of nervous system 7) Simplification/Loss of reproductive system 8) Elaboration of reproductive system 9) Gradual complexity of life cycle 10) Endoparasites become anaerobic |
|
|
Requirements for Parasitic Success |
1) Reproduction within the definitive host 2) Get fertilized eggs/embryos out of host 3) Contact and recognize new, appropriate host 4) Obtain entrance into host 5) Locate proper environment within the host 6) Maintain position within the host 7) Withstand anaerobic environment 8) Avoid digestion or attack by the host's immune system 9) Avoid killing the host until reproduction has been achieved |
|
|
Nematoda and Annelida comparison |
1) Annelida segmented, Nematoda smooth 2) Both marine, freshwater, terrestrial forms 3) Annelida Schizocoelous coelom, Nematoda pseudocoelom 4) Annelida circular muscles, Nematoda no circular 5) Both longitudinal muscles |
|
|
Annelida and Platyhelminthes comparison |
1) Platyhelminthes first segmentation, Annelida all segmentation 2) Platyhelminthes acoelomata, Annelida schizocoelous coelom 3) Platyhelminthes protonephridia, Annelida metanephridia 4) Both protostomes 5) |
|
|
Nematoda and Platyhelminthes comparison |
1) Platyhelminthes bilateral, Nematoda bilateral but radially arranged along longitudinal axis 2) Both have parasitic and free-living forms 3) Platyhelminthe primitive head, Nematoda no head 4) Platyhelminthes first segmentation, Nematoda no division 5) Platyhelminthes acoelomata, Nematoda pseudocoelom |
